Calculation of the contrast of moire deflectometric fringes

Xiangqun Cao; Weijian Cai

doi:10.1117/12.165450

10 December 1993 Calculation of the contrast of moire deflectometric fringes

Xiangqun Cao, Weijian Cai

Proceedings Volume 2003, Interferometry VI: Techniques and Analysis; (1993) https://doi.org/10.1117/12.165450
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

In a moire deflectometric phase object measuring system the contrast of the moire fringes formed by the first grating (G₁) image and the second grating (G₂) degrates and it causes some measurement errors in the system because of the diffraction effect of G₁. This paper analyzes and measures the contrast degradation of the image of G₁ directly. The complex amplitude, intensity, and contrast expressions of the G₁ images with varied distance to the grating are also formulated and it is concluded that the determinative factors affecting the contrast of the grating image, in other words, the moire deflectometric fringes, are the black-white ratio of grating and the distance between the image and the grating.

Citation Download Citation

Xiangqun Cao and Weijian Cai "Calculation of the contrast of moire deflectometric fringes", Proc. SPIE 2003, Interferometry VI: Techniques and Analysis, (10 December 1993); https://doi.org/10.1117/12.165450

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